Composer support

Added composer.json and modified autoconfig to function with composer.  Tested on some personal projects.  Allows developer to install using composer, and run out of the box.  

To test, simply add this to your composer.json under the "repositories" property. 

          {
            "type": "vcs",
            "url" : "https://github.com/nbomberger/Hydrogen"
          }

And under "require":

      "hydrogen/hydrogen": "@dev"

 This has not been submitted to Packagegist yet, but can be tested using the above.  To submit to Packagegist, you may need to modify the license file.   This will download from the forked repository, however, to merge with main simply add the composer.json and submit to packagegist.